diff options
| -rw-r--r-- | doc/user/smp.t | 20 |
1 files changed, 10 insertions, 10 deletions
diff --git a/doc/user/smp.t b/doc/user/smp.t index c21c8a0791..84372698ea 100644 --- a/doc/user/smp.t +++ b/doc/user/smp.t @@ -307,16 +307,16 @@ The Classic API provides three directives to support per task variables. These a @item @code{@value{DIRPREFIX}task_variable_delete} - Remove per task variable @end itemize -As task variables are unsafe for use on SMP systems, the use of these -services should be eliminated in all software that is to be used in -an SMP environment. It is recommended that the application developer -consider the use of POSIX Keys or Thread Local Storage (TLS). POSIX Keys -are not enabled in all RTEMS configurations. - -@b{STATUS}: As of March 2014, some support services in the -@code{rtems/cpukit} use per task variables. When these uses are -eliminated, the per task variable directives will be disabled when -building RTEMS in SMP configuration. +As task variables are unsafe for use on SMP systems, the use of these services +must be eliminated in all software that is to be used in an SMP environment. +The task variables API is disabled on SMP. Its use will lead to compile-time +and link-time errors. It is recommended that the application developer consider +the use of POSIX Keys or Thread Local Storage (TLS). POSIX Keys are available +in all RTEMS configurations. For the availablity of TLS on a particular +architecture please consult the @cite{RTEMS CPU Architecture Supplement}. + +The only remaining user of task variables in the RTEMS code base is the Ada +support. So basically Ada is not available on RTEMS SMP. @c @c |